And there's this (though I find it hard to believe that any security force in the United States would call themselves "brown shirts", but maybe they don't care):
Medical staff warned: Keep your mouths shut about illegal immigrants or face arrest
(excerpts)
A government-contracted security force threatened to arrest doctors and nurses if they divulged any information about the contagion threat at a refugee camp housing illegal alien children at Lackland Air Force Base in San Antonio, Texas, sources say.
In spite of the threat, several former camp workers broke their confidentiality agreements and shared exclusive details with me about the dangerous conditions at the camp. They said taxpayers deserve to know about the contagious diseases and the risks the children pose to Americans.
The sources said workers were guarded by a security force from the BCFS, which the Department of Health and Human Services hired to run the Lackland Camp.
The sources say security forces called themselves the “Brown Shirts.”
“It was a very submissive atmosphere,” the counselor said. “Once you stepped onto the grounds, you abided by their laws – the Brown Shirt laws.”
http://www.foxnews.com/opinion/2014/07/02/medical-staff-warned-keep-quiet-about-illegal-immigrants-or-face-arrest/